Photographic peracid bleaches with ferric 2-pyridinecarboxylate and 2,6-pyridinecarboxylate catalysts
US5460924A · kind A · utility
37Cited by
11References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 20, 1994 |
| Grant date | Oct 24, 1995 |
| Priority date | — |
| Expiry date | Apr 20, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/144
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
This invention provides an accelerator for peracid bleaches used for bleaching silver halide photographic elements. The accelerator is a complex of ferric (Fe III) ion and a 2-pyridinecarboxylic acid or a 2,6-pyridinecarboxylic acid. The accelerator may be contained in the bleaching solution, a solution preceding the bleaching solution or in the photographic elements themselves.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.